Head feed device

Claim 2

A head feed device comprising: (a) a head arranged to perform a recording and/or reproducing operation on a recording medium; (b) a carriage member arranged to carry said head and to be displaceable for causing said head to face different parts of said recording medium; (c) guide means arranged to linearly guide the displacement of said carriage member along a surface of said recording medium, said guide means having two parallel guide shafts, one of said guide shafts having two parts on its axis provided so as to be engageable with two engaging portions of said carriage member so as to movably guide said carriage member; said two guide parts being shafts having smooth and uninterrupted cylindrical surfaces which provides a respective continuous surface for contact with each respective engaging portion; (d) a transmission member arranged and fixed to a part of said one guide shaft between said two guide parts so as to displace said carriage member, said transmission member having a lead screw member provided so as to engage a portion of said carriage member between said two engaging portions; and (e) a drive source arranged to rotate said transmission member.

Claim 3

A device according to claim 1, wherein said head is a magnetic head.

Claim 4

A device according to claim 2, wherein said recording medium is a magnetic recording medium.

Claim 5

A device according to claim 1, wherein said recording medium is disc-shaped.

Claim 6

A device according to claim 4, further comprising a motor which is arranged to rotate said disc-shaped recording medium.

Claim 7

A device according to claim 4, wherein said guide shaft is arranged to guide said carriage member in a direction in parallel with a radial direction of said disc-shaped recording medium.

Claim 8

A device according to claim 1, wherein said transmission member includes a helical screw having a helical groove.

Claim 9

A device according to claim 7, wherein said carriage member is provided with a projection which is formed at a part of the carriage member and is arranged to be guided by the helical groove of said helical screw.

Claim 10

A head feed device comprising: (a) a head arranged to perform a recording and/or reproducing operation on a recording medium; (b) a carriage member arranged to carry said head and to be displaceable for causing said head to face different parts of said recording medium; (c) guide means arranged to linearly guide the displacement of said carriage member along a surface of said recording medium, said guide means having two parallel guide shafts, one of said guide shafts having two parts on its axis provided so as to be engageable with two engaging portions of said carriage member so as to movably guide said carriage member; said two guide parts being shafts having smooth and uninterrupted cylindrical surfaces which provides a respective continuous surface for contact with each respective engaging portion; (d) a rotating member rotating on said guide shaft using the guide shaft as an axis of rotation thereof, said rotating member being arranged to a part of said one guide shaft between said two guide parts to transmit a driving force to said carriage member for said displacement of the carriage member, said rotating member being arranged so as to transform rotary movement thereof into movement for moving said carriage in an axial direction; and (e) a drive source which is coupled with said rotating member and is arranged to cause said rotating member to rotate.

Claim 11

A head feed device comprising: (a) a head arranged to perform a recording and/or reproducing operation on a recording medium; (b) a carriage member arranged to carry said head and to be displaceable for causing said head to face different parts of said recording medium; (c) guide means arranged to linearly guide the displacement of said carriage member along a surface of said recording medium, said guide means having two parallel guide shafts, one of said guide shafts having two parts on its axis provided so as to be engageable with two engaging portions of said carriage member so as to movably guide said carriage member; said two guide parts being shafts having smooth and uninterrupted cylindrical surfaces which provides a respective continuous surface for contact with each respective engaging portion; (d) a rotating member rotating on said guide shaft using the guide shaft as an axis of rotation thereof, said rotating member being arranged to a part of said one guide shaft between said two guide parts to transmit a driving force to said carriage member for said displacement of the carriage member, said rotating member being arranged so as to transform rotary movement thereof into movement for moving said carriage in an axial direction; and (e) a drive source which is coupled with said rotating member and is arranged to cause said rotating member to rotate.

Claim 12

A device according to claim 9, wherein said head is a magnetic head.

Claim 13

A device according to claim 10, wherein said recording medium is a magnetic recording medium.

Claim 14

A device according to claim 9, wherein said recording medium is disc-shaped.

Claim 15

A device according to claim 12, further comprising a motor which is arranged to rotate said disc-shaped recording medium.

Claim 16

A device according to claim 12, wherein said guide shaft is arranged to guide said carriage member in a direction in parallel with a radial direction of said disc-shaped recording medium.

Claim 17

A device according to claim 9, wherein said rotating member includes a helical screw which has a helical groove.

Claim 18

A device according to claim 15, wherein said carriage member is provided with a projection which is formed at a part of the carriage member and is arranged to be guided by the helical groove of said helical screw.

Claim 19

A head feed device comprising: (a) a head arranged to perform a recording and/or reproducing operation on a recording medium; (b) a carriage member arranged to carry said head; (c) a drive source arranged to display and shift said carriage member along a surface of said recording medium; (d) a transmission shaft having a transmitting member provided at a part thereof for transmitting the driving force of said drive source to said carriage member, said transmission shaft having guide shaft portions on both sides of said transmission member which engage two engaging portions on said carriage member to movably guide said carriage member in an axial direction and do not transmit the driving force; said guide shaft portions being shafts having smooth and uninterrupted cylindrical surfaces which provides a respective continuous surface for contact with each respective engaging portion; (e) a guide shaft arranged parallel to said transmission shaft so as to engage with said carriage member and movably guide said carriage member in its axial direction; and (f) coupling means for slidably coupling said carriage member at said guide shaft portions on both sides of said transmitting member.

Claim 20

A head feed device comprising: (a) a head arranged to perform a recording and/or reproducing operation on a recording medium; (b) a carriage member arranged to carry said head; (c) a drive source arranged to display and shift said carriage member along a surface of said recording medium; (d) a transmission shaft having a transmitting member provided at a part thereof for transmitting the driving force of said drive source to said carriage member, said transmission shaft having guide shaft portions on both sides of said transmission member which engage two engaging portions on said carriage member to movably guide said carriage member in an axial direction and do not transmit the driving force; said guide shaft portions being shafts having smooth and uninterrupted cylindrical surfaces which provides a respective continuous surface for contact with each respective engaging portion; (e) a guide shaft arranged parallel to said transmission shaft so as to engage with said carriage member and movably guide said carriage member in its axial direction; and (f) coupling means for slidably coupling said carriage member at said guide shaft portions on both sides of said transmitting member.

Claim 21

A device according to claim 17, wherein said head is a magnetic head.

Claim 22

A device according to claim 18, wherein said recording medium is a magnetic recording medium.

Claim 23

A device according to claim 18, wherein said recording medium is disc-shaped.

Claim 24

A device according to claim 20, further comprising a motor which is arranged to rotate said disc-shaped recording medium.

Claim 25

A device according to claim 20, wherein said transmission shaft is arranged to guide said carriage member in parallel with a radial direction of said disc-shaped recording medium.

Claim 26

A device according to claim 17, wherein said transmission shaft includes a helical screw which has a helical groove.

Claim 27

A device according to claim 23, wherein said carriage member is provided with a projection which is formed at a part of the carriage member and is arranged to be guided by the helical groove of said helical screw.

Claim 28

A device according to claim 17, wherein said coupling means includes a bearing which is arranged at said carriage member to have said transmission shaft inserted therethrough.

Claim 29

A device according to claim 25, wherein said bearing is an oil impregnated sintered bearing.